Window header



FIG. 1 is a persective view looking down on the window header;

FIG. 2 is an end view of the window header;

FIG. 3 is a top view of the window header;

FIG. 4 is a rear view of the window header;

FIG. 5 is a front view of the window header; and,

FIG. 6 is a bottom view of the window header.

The window header is broken in the center to indicate indeterminate length. 

The ornamental design for a window header, as shown and described. 